Safety attachment for elevators



(No Model.) Q 3 Sheets-Sheet I. T. M. HUNTER.

SAFETY ATTACHMENT FOR ELEVATORS. No. 337,768. Patented Mar. 9, 1886.

mmwww u. puns mmmr h-r, Washington ac.

(No Model.) I 3 Sheets- Sheet 2.

T. M. HUNTER. SAFETY ATTAGHMENTFOR ELEVATORS.

No. 337,768. Patented Mar. 9, 1886.

IJV VEJV' TOR I 4 ttorneyJ N. PETERS. Phoiwuihograpbur. Wnhinflon. n. c.

(No Model.) a Sheets-SheetB.

T. M. HUNTER. SAFETY ATTACHMENT FOR ELEVATORS.

No. 337,768. Patent-ed Mar. 9 1886.

I F A U I T IE" w- T T z 16. Mae f .ittorneyJ I N. PETERS. Fpcln-LhMgA-aphon Wnhi nnnnn c 'Nrren STATES THOMAS MARVIN HUNTER, OF NEW YORK, N. Y., ASSIGNOB OF ONE-HALF TO WVILLIAM J. BEST AND LOUISE JORDAN, BOTH OF SAME PLACE.

SAFETY ATTACHMENT FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 337,768, dated March 9, 1886.

Application filed December 30, 1885. Serial N0.187,075. (No model.)

To aZZ whom it may concern.-

Be it known that I, THOMAS ll IARVIN HUNT- ER, a citizen of the United States, and a resident of New York. in the county of New York and State of New York, have invented certain new and useful Improvements in Safety Attachments for Elevators; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will to enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification, and in which- Figure 1 is a side view or elevation of aportion ofone side of an elevator-well equipped with my improved safety attachment. Fig. 2 is a vertical sectional view of the same, taken on the line at w in Fig. 1. Fig. 3 is a side view of one of the safety stops or dogs detached. Fig. 4 is a detail view showing in perspective the constituent parts of the safety-rail in which the dogs are pivoted. Fig. 5 is a vertical sectional view of the elevator-car, showing in elevation a portion of the side of the elevatorwell, parts having been broken away for the purpose of illustrating the construction more clearly. Fig. 6 is a horizontal sectional view taken on the line a: x in Fig. 5. Fig. 7 is a vertical sectional view taken on the line yg in Fig. 6, and Fig. 8 is a perspective view illustratiug means whereby the safety attachment will be operated automatically in case of breakage of the cable.

, The same letters refer to the same parts in all the figures.

This invention relates to safety stops or dogs for passenger and other elevators, inclined plane railways, and the like; and it has for 0 its object to provide a device which shall operate with certainty and form a positive stop for the purpose of automatically arresting the descent of the car in case of the operating apparatus becoming fractured or disarranged,

5 thereby preventing any destructive fall of the car and the danger and danuge resulting therefrom.

With these ends in View the invention consists in the improved Loastruction, arrangement, and combination of parts, which will I be hereinafter fully described, and particularly pointed out in the claims.

In the drawings hereto annexed, A A designate the vertical side beams of an elevatorwell, upon which are secured vertical guiderails B B, of ordinary construction.

0 is the safety-rail, which is secured to one of the vertical side beams, in front of and parallel to the guide-rail. The said safety-rail is composed of a seriesof sections, D, E, and F, arranged with relation to each other as shown in the drawings hereto annexed. Section D consists of a base-plate, G, having at its rear edge a vertical flange, H, the face of which is provided at its upper and lower ends with 55 recesses or shoulders I. The upper end of the flange H and the corresponding portion of the base-plate has a transverse notch, J, and the lower end of the flange and baseplate is beveled, as shown at K K, so as to form a trian- 7o gular projection or extension, L. The section E, which forms a continuation of the baseplate between two sections, D D, consists of a flat plate of hard iron, the upper end of which is provided with a triangular recess, M, to receive the projection L, at the lower end of the section D. The lower end of the plate forming the section E is provided with a triangular tooth or extension, N, adapted to enter the notch J in the section D next below. The plate E is provided with a perforation or opening, O, to receive the inner end of the bolt upon which the safety-dog is pivoted, as will be presently described. The sectionF consists of a plate adapted to be seated in the recesses, or against the shoulders I I of two adjoining sections, where it is firmly bolted or otherwise secured flush with the 'faces of the flanges H of said sections. Said plate is provided with a i'orwardly-ex- 9c tending lug, 1, having a transverse perforation, Q, registering with the opening 0 in the plate or section E. The openings 0 and Q form the bearings for the bolt R of the dog S, which will be presently more fully de- 5 scribed. By this construction of the safetyrail, as I have called it, it may be easily constructcd in small or short sections, bringing the dogs as closely together as may be desired.

The parts are so constructed as to brace each IQQ other mutually, thereby insuring great strength, and the construction is simple and inexpensive, and the parts easily handled and put together.

5 The dog S, which isshown in detail in Fig. 30f

the drawing,consists ofa body, a, having a perforation or pivot-hole, I), formed transversely therein, as shown. The main portion or weight ofthe body a is above and to one side ot'the pivot-hole, below and to the other side ofwhich is a portion, 0, which may be termed the toepiece, the extreme lower end of which has arecess, d, in which isjournaled a friction-roller, 6, the periphery of which extends-beyond the toe-piece. At the lower end of the body portionct is formed a trianguiar heel, f. The upper end of the body a forms a flat surface, audits inner side has a recess, in which is seated a projecting cushion, It, of rubber or other suitable material. When the dog is placed in position,the'heelj' is seated or rests in the notch J at the upper end of the flange H of section D of the safety-rail, one dog being of course used for each such section.

The bolt R isthen passed through the perforations 0 Q and the pivot-hole I), thus securing the dog in position for operation. The upper portion of the dog will by its own weight be tilted into the space or channel T between; 0 the guide-rail B and safety-rail C until the buf-;

fer It rests in contact with the former. The

lower portion or toe-piece of the said dog will sthns be tilted out in front of the flange H of the safety-rail.

U designates the elevator-car, the frame portion of which may be of any suitable construction. The lower portion of the frame is provided with grooved beams V V, forming guides for a frame, NV, arranged to slide longitudinally in the said guides, and having a laterally-extending arm, X,extending through a slot, Y, in the outer one of said guides. Said arm carries a beveled block, Z, which, when the frame is pushed in an inward direction, is adapted to engage the toe-pieces of the safety-dogs, thereby throwing the upper ends of the latter in a forward direction between the platesE and F, and out of the way of the car. Normally, however, the frame W is, by the action of a suitably-arranged spring, A, forced in an outward direction, the result of which is, that as the car descends the first dog encountered by the lower end of the guide-beam, B, upon the outside of the car-frame will arrest the descent of the car. In order, therefore, to enable the frameW to be moved in an inward direction, so as to enable the descent of the car to take place under ordinary circumstances, mechanism is provided as follows:

Pivoted under the car-floor in asuitable hanger or bearing, 0, is a bell-crank lever, D, the lower end or arm of which is connected by a suitable rod, E, with the inner end of the frame, while its horizontal arm forms a tread or bearing for a sliding foot-piece, F, extendengage the successive pawls.

ing vertically through the floor of the car.

'When it is desired that the car shall descend,

the frame Win an inward direction against.

the tension of the spring A, and causing the block Z tostrikethe toes of andlthereby dis- In case of any accident, simply releasing-the foot-piece F will cause the frame Wto be forced outwardly b i the s rin A,thereb causin the pawlsto I 3 P g y s remain in operative position, so that the descent of the car will be checked by the first pawl which it encounters.

In Fig. 8 of'the drawings I have shown mechanism by which the safety mechanism shall be throwninto action automaticallya-nd with absolute certainty in case of breakage of the supportingcable. The latter, which is denoted by letter G, is connected in the usual manner with the suspension-spring H at the top of the car. Said spring is connected by a clip, I, with one end ot'alever, J, the other end of which is connected by a rod or cord, K,

with one arm of a bell-crank ,lever, L, the,

other arm of which bears against one end of a lever, M, the other end of which in turn bears against the rear or inner side of the arm X of the frame W. Under normal circumstances this mechanism is inactive; but in case of breakage of the supporting-cable the lever M will act to force the frame W in an outward or forward direction, or, in other words, into operative position.

From the foregoing description, taken in connection with the drawings hereto annexed, the operation and advantages of this invention will be readily understood. The construction is simple and inexpensive, and the operation is certain and efficient.

I would have it understood that in the construction of this device I do not limit myself to the precise construction herein claimed, but reserve to myself the right to all modifications which may be resorted to without departing from the spirit of my invention.

Having thus described my invention,Iclaim and desire to secure by Letters Patent 01'' the United States- 1. In a safety attachment for elevators, the safety-rail consisting of sections D, E, and F, constructed and arranged substantially as and for the purpose herein shown and specified.

2. In a safety attachment for elevators, the herein-descri bed safety-rail having sections D, provided with vertical flanges having notches at their upper ends to receive the heels of the safety-pawls, substantially as and for the purpose herein set forth.

3. In a safety attachment for elevators, the

herein-described safety-rail, consisting of sections D, having flanges H, base-plates G, recesses I, notches J, and extensions L, the sections E, consisting ofcflat plates forming continuations of the base-plates ofthe sections D,

and having recesses M and teeth N, and the sections F,secured in the recesses I of adjoining sections D, substantially as and for the purpose set forth.

4. In a safety attachment for elevators, the safety-rail consisting of sections D, in combination with sectionsF. and F, which conjointly form the bearings for the safety-dogs, substantially as herein described, for the purpose set forth.

5. In a safety attachment for elevators, the herein-described safety-rail, consisting of sections E and F, having bearings for the pivots of the safety-dogs, in combination with the intermediate supporting-sections, D, the upper ends of which have transverse notches or re cesses, in which the safety-dogs are supported when at rest, substantially as and for the purpose set forth.

6. In a safety attachment for elevators, the combination, with the safety-rail, constructed substantially as herein described, of the dogs pivoted between the sections E F of said safetyrail, and having upwardly extending weighted bodies, heel-pieces, and projecting toe-pieces provided with friction-rollers, substantially as herein described, for the purpose set forth.

7. In a safety'attachment for elevators the combination, with a suitablesafety-rail, ofthe herein-described dogs S, having body a, pivothole b, toe-piece a, recess d, friction-roller e,

heel f, and cushion h, substantially as herein ,1

THOMAS MARVIN HUNTER.

Witnesses:

EDWARD TAYLOR, ABRAHAM L. ERLANGER.

Hard- 

